/**
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [https://neo4j.com]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import nodeDns from 'dns'
import { internal } from 'neo4j-driver-core'

const {
  resolver: { BaseHostNameResolver }
} = internal

export default class NodeHostNameResolver extends BaseHostNameResolver {
  resolve (address) {
    return new Promise(resolve => {
      nodeDns.lookup(address.host(), { all: true }, (error, resolvedTo) => {
        if (error) {
          resolve([address])
        } else {
          const resolvedAddresses = resolvedTo.map(a =>
            address.resolveWith(a.address)
          )
          resolve(resolvedAddresses)
        }
      })
    })
  }
}
